Rule and try-square



UNITED STATES PATENT OFF E.

\VILEY N. NASH, OF STARKVILLE, MISSISSIPPI.

RULE AND TRY-SQUARE.

SPECIFICATION forming part of LettersPatent No. 293,497, dated. February 12, 1884.

v Application filed November 20, 1883. (No model.)

' Starkville, in the county of Oktibbeha and State of .Mississippi, have invented certain new and useful Improvements in Drafting- Instruments; and I do hereby declare that the following is a full, clear, and exact descriptio of the same.

My invention relates to improvements in drafting implements, the object being to combine in asingle instrumenta rule, square, and measure of novel construction and peculiar arrangement.

The invention consists, partly, in combining with a square block or plate of uniform thickness, which forms the corner-piece of the square, peculiarly-beveled arms which contain the scale, and also in details of construction fully hereinafter explained.

In the drawings accompanying this specification, Figure l is a plan view of the implement. Figs. 2and 3 are views of the beveled edges of the long and short arms, respectively. Fig. 4 is a perspective view.

The implement is composed of a cornerpiece, A, and two arms, A A extending at right angles, the device being formed, preferably, of a single piece of suitable material, such as elastic wood, hard rubber, or thin metal. The part A is a perfect square of uniform thickness throughout. The arm A- is divided into two triangular surfaces, B D, by a line extending from the point or corner 11 on the arm to the corner diagonally opposite on the part A. The portion marked D is of the same thickness as the square part A, so that their surfaces are flush at the point where they meet. The part B of the arm A is beveled uniformly on both sides from the diagonal line referred to to the point 6, where the inner edges of arms A A meet, the effect being to form shoulders extending and diminishing from the point 6 laterally The inner edge of the arm A is thus reduced in thickness, but its thickness increases uniformly to the point 11.

The outer edge of arm A, extending from the point 8 to 9, is beveled in the manner common to all rulers. The longer arm, A

is divided in like manner into two parts, 0 and E, the inner part, 0, being beveled to- .ward the'point 6, and shoulders being formed by the square A, in the manner before described. The outer edge,extending from 7 to 8, has an ordinary beveled edge. The entire "outer rulingedge of the square, extending from 7 to 9,is thus of equal thickess throughout. The inner edge,extending from 10 to 11, is square, and stands at right angles to the surface on which it is used.

On the ruling-edges I lay off inch or metrical scales, or both, if desired. A series of distinctive points are formed on the ruler near each edge, and from these the scale-lines extend toward the edge. I

I have shown in Figs. 1 and 4, on all the ruling-edges, a series of these points, which are simply small sinks or depressions in the surface, suitably colored, from which the scale lines extend.

The principal advantages of my construction are that when ruling on the inner edges the edge does not touch the paper, and thus not only permits an ordinary pen to be used without danger of blotting, but also enables the rule to pass partly over an inked line Without coming in contact with it. Further,

that the shoulders on all sides of part A enable the draftsman to use the edge of the pathe inner triangular portions being beveled from the diagonal line of division to the right angle 6, substantially as described.

2. A try square having its outer ruling edges of uniform thickness and its inner rul-.

ing-edges of increasing thickness toward their outer ends, substantially as described.

3. As a new article of manufacture, a' trysquare having a square corner-piece, A, of uniform thickness, and arms A A beveled on both sides thereof, substantially as described.

XVILEY N. NASH. Vitnesses:

ADOLPH ZUCKER, E. B. B. ZUGKER.

IOO 

